KR20190057719A - Membrane filter plate for filter press with improved durability and mechanical property - Google Patents

Abstract

The present invention relates to a membrane filter plate for a filter press. The present invention provides a membrane filter plate for a filter press having a thin thickness and excellent durability and mechanical properties. A resin composition comprising a styrene-ethlyene-butylene-styrene block copolymer, polypropylene, organic peroxide, and a filter is used to form the filter plate, wherein the resin composition comprises 3-10 wt% of the styrene-ethlyene-butylene-styrene block copolymer, 60-80 wt% of polypropylene, 2-7 wt% of the filler, and residual of organic peroxide based on the total weight of the resin composition.

Description

TECHNICAL FIELD [0001] The present invention relates to a membrane filter plate for a filter press having improved durability and mechanical properties,

The present invention relates to a membrane filter plate for a filter press having improved durability and mechanical properties.

Due to the urbanization and industrialization of modern society, the treatment of sludge, which is additionally generated in the treatment of increased sewage and wastewater, is becoming one of the biggest problems of modern society. In general, the treatment of sewage and wastewater is carried out by treating the sewage and wastewater through a sewage and wastewater treatment apparatus, dehydrating the sludge generated at this time, and filling or incinerating the sludge.

Dehydration of the sludge can be carried out by natural and mechanical methods. Natural dehydration methods include sand drying method and lagoon method. However, mechanical dehydration method is increasingly applied recently because there are problems such as reduction of available land and contamination of groundwater. In the mechanical dehydration method, a filter press, a belt press, a screw press, a centrifugal dehydrator, and an electroosmotic dehydrator may be applied according to the operation principle. Among them, a filter press includes at least two filter plates, and the sludge is press-fitted into a space between the filter plates contacting with each other to separate the filtrate from the sludge. Then, the cake (filtrate solid separated sludge) To remove sludge from the sludge.

Meanwhile, in the process of dewatering the sludge using the filter press, pressure is applied to the filter plate by the introduced sludge, and when the dewatering of the sludge is finished, the pressure applied to the filter plate disappears. That is, since the action and release of the pressure are repeatedly performed on the filter plate of the filter press, the filter plate of the filter press is required to have excellent durability and mechanical properties capable of withstanding a change in pressure and pressure.

Korean Patent Publication No. 10-2000-0054118 discloses a composition of a filter plate having improved mechanical properties including natural rubber, synthetic rubber, sulfur, zinc oxide, stearic acid, accelerator, processed resin, foaming agent and conductive filler However, the durability and the mechanical properties of the filter plate are still insufficient, so that the filter plate can not sufficiently withstand high pressure or repetitive pressure changes and is damaged or bleached.

Further, in the prior art, the thickness of the filter plate itself is increased in order to improve durability and mechanical properties of the filter plate. However, in this case, not only the economical efficiency is lowered but also the usability or convenience is lowered as the volume of the device is increased. In addition, there has been a problem that as the thickness of the filter plate increases, the elongation and elastic modulus of the filter plate decrease.

Korea Patent No. 10-0656807

It is an object of the present invention to provide a membrane filter plate for a filter press having a thin thickness and excellent durability and mechanical properties.

The object of the present invention is not limited to the above-described technical problems, and another technical problem can be derived from the following description.

In order to achieve the above object, the present invention provides a membrane filter plate for a filter press, wherein the membrane filter plate for the filter press comprises a styrene-ethylene-butylene-styrene block copolymer, A polypropylene resin, a filler and an organic peroxide, wherein the resin composition comprises 3 to 10% by weight of a styrene-ethylene-butylene-styrene block copolymer based on the total weight of the resin composition, 60 to 80% by weight of a filler, 2 to 7% by weight of a filler, and residual organic peroxide.

The resin composition may contain the styrene-ethylene-butylene-styrene block copolymer and the polypropylene in a weight ratio of 1: 4 to 7.

Wherein the filler is barium sulfate (Barium sulfate), MgO (Magnesium oxide), calcium carbonate (Calcium carbonate), titanium dioxide (Titanium dioxide), zinc oxide (Zinc oxide), alumina (Alumina), silica (Silica), mica ( Mica, Talc, Clay, Bentonite , Zeolite, Glass fiber, and Carbon black. In the present invention, .

Wherein the filler is a calcium carbonate (Calcium carbonate), bentonite (Bentonite) and zeolite (Zeolite) 1: may comprise 0.1 to 2 weight ratio of 0.1 to 2.

The organic peroxides may be selected from the group consisting of t-amyl peroxybenzoate, t-butyl hydroperoxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, t-butyl peroxyisopropylcarbonate, diacetyl peroxide, And at least one selected from the group consisting of dibenzoyl peroxide, dicyclohexane, dibutylperoxyl dicarbonate, trimethyl cyclohexane, dideckanoyl peroxide and peroxyl dicarbonate.

The resin composition may further include an additive including at least one selected from the group consisting of a defoaming agent, a pigment, an antioxidant, and a light stabilizer.

The membrane filter plate for a filter press of the present invention is formed by using a resin composition comprising a styrene-ethylene-butylene-styrene block copolymer, polypropylene, an organic peroxide and a filler, wherein the resin composition comprises The present invention relates to a thermoplastic elastomer composition comprising 3 to 10% by weight of a styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of a polypropylene, 2 to 7% by weight of a filler and residual organic peroxides, Mechanical properties such as elongation and strength are excellent, and whitening may not occur.

1 is a perspective view of a membrane filtration plate for a filter press according to an embodiment of the present invention.
FIG. 2 is a photograph showing a photograph of a membrane filter plate for a filter press shown in FIG. 1. FIG.
FIG. 3 is a view showing a part of a filter press to which the membrane filter plate for the filter press of FIG. 1 is applied.
4 is a cross-sectional view of a membrane filtration plate for a filter press according to an embodiment of the present invention and a cross-section of a conventional membrane filter plate for a filter press.
5 is a view showing Example 1 in which tensile and shrinkage are repeated 100,000 times in accordance with (1) of Experimental Example 2. FIG.
6 is a view showing Example 3 in which tensile and shrinkage were repeated 100,000 times in accordance with Experiment 2 (1).
7 is a view showing Example 6 in which tensile and shrinkage are repeated 100,000 times in accordance with (1) of Experimental Example 2. FIG.
8 is a view showing Example 7 in which tensile and shrinkage were repeated 100,000 times in accordance with Experiment 2 (1).
9 is a graph showing Comparative Example 2 in which tensile and shrinkage were repeated 100,000 times in accordance with Experiment 2 (1).
10 is a graph showing Comparative Example 3 in which tensile and shrinkage were repeated 100,000 times in accordance with Experiment 2 (1).
11 is a view showing Comparative Example 4 in which tensile and shrinkage are repeated 100,000 times in accordance with (1) of Experimental Example 2. FIG.
12 is a graph showing Comparative Example 5 in which tensile and shrinkage were repeated 100,000 times in accordance with Experiment 2 (1).
13 is a graph showing Comparative Example 6 in which tensile and shrinkage were repeated 100,000 times in accordance with (1) of Experimental Example 2. FIG.
14 is a graph showing Comparative Example 7 in which tensile and shrinkage were repeated 100,000 times in accordance with Experiment 2 (1).
15 is a graph showing Comparative Example 1 in which tensile and shrinkage were repeated 100,000 times in accordance with Experiment 2 (1).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted.

It is to be understood that the terms or words used in the specification and claims are not to be construed in a conventional or dictionary sense and that the inventor may properly define the concept of a term in order to best describe its invention And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

In the specification of the present invention, when a component is referred to as " comprising ", it means that it can include other components as well as other components, .

In the specification of the present invention, " A and / or B " means A or B, or A and B.

Throughout the specification of the present invention, " membrane filter plate for filter press " can be briefly referred to as " filter plate ".

Throughout the specification of the present invention, "mechanical properties" may mean tensile strength, yield elongation, elongation at break, tensile modulus, flexural strength, flexural modulus, impact strength,

The present invention has been specifically described below, but the present invention is not limited thereto.

In the present invention, for a filter press having improved durability and mechanical properties Membrane Filter plate  to provide.

In one embodiment of the present invention, a resin composition including a styrene-ethylene-butylene-styrene block copolymer, polypropylene, organic peroxide and a filler is used to form The resin composition preferably contains 3 to 10% by weight of a styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of a polypropylene, 2 to 7% by weight of a filler and a residual organic peroxide It is possible to provide a membrane filter plate for a filter press which is thin in thickness and excellent in mechanical properties such as durability, tensile strength, elongation and strength, and has almost no whitening phenomenon. In addition, since the thickness is thin and the durability is excellent, economical efficiency can be improved by using a small amount of material, that is, a small amount of resin composition.

The membrane filter plate for a filter press of the present example is a membrane filter plate comprising 3 to 10% by weight of a styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of a polypropylene, 2 to 7% by weight of a filler, The resin composition of the present invention may be, for example, but not limited to, a resin having a specific shape. The specific shape may be a shape of a membrane filter plate for all known filter presses.

The styrene-ethylene-butylene-styrene block copolymer is a polystyrene thermoplastic elastomer called SEBS. The thermoplastic elastomer has properties similar to those of an elastomer, and can be repeatedly deformed and restored like a thermoplastic resin, and has flowability and moldability. Further, the styrene-ethylene-butylene-styrene block copolymer can improve the elasticity and tensile strength of the filter plate of the present embodiment.

In this embodiment, a styrene-butadiene-styrene block copolymer (SBS), a styrene-butadiene block copolymer (SB), a styrene-isoprene-butadiene-styrene block copolymer (SIBS), a styrene-ethylene-butadiene block copolymer Ethylene-propylene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-butadiene-butylene-styrene block copolymer (SBBS), and styrene- (SEBS), a membrane filter plate for a filter press having a small thickness and excellent durability and mechanical properties can be formed by using a styrene-ethylene-butylene-styrene block copolymer (SEBS).

The resin composition of the present embodiment contains 3 to 10% by weight, preferably 4 to 8% by weight, and more preferably 6 to 7% by weight of a styrene-ethylene-butylene-styrene block copolymer based on the total weight of the resin composition can do.

If the styrene-ethylene-butylene-styrene block copolymer is contained in an amount of less than 3% by weight based on the total weight of the resin composition of this embodiment, the durability and mechanical properties of the filter plate of this embodiment may not be sufficient, There may be a problem that occurs. On the other hand, when the styrene-ethylene-butylene-styrene block copolymer is contained in an amount of more than 10% by weight based on the total weight of the resin composition of the present embodiment, the flowability of the styrene-ethylene-butylene- The durability and the mechanical properties of the conventional filter plate may be deteriorated and whitening may occur.

Polypropylene is a resin obtained by polymerization of propylene. It is a thermoplastic resin having fluidity and moldability when exposed to heat or shearing force, and having rigidity again when it is cooled. In this embodiment, the durability of the filter plate can be further improved by using a polypropylene having a degree of polymerization of about 600 to 800, preferably a degree of polymerization of 650 to 750, more preferably 680 to 700. If the degree of polymerization of polypropylene is out of the range of 600 to 800 in this embodiment, the durability of the filter plate may not be sufficiently improved.

The resin composition of this embodiment may contain 60 to 80 wt%, preferably 67 to 74 wt%, and more preferably 72 to 73 wt% of polypropylene based on the total weight of the resin composition.

If the polypropylene is contained in an amount of less than 60% by weight based on the total weight of the resin composition of this embodiment, the durability and mechanical properties of the filter plate of this embodiment are not sufficient, and whitening may occur. On the other hand, when the polypropylene is contained in an amount of more than 80% by weight based on the total weight of the resin composition of the present embodiment, the flowability and moldability of the polypropylene are increased by the heat generated in the process of dewatering the sludge, There may be a problem that durability and mechanical properties are remarkably deteriorated, and whitening may occur.

In this embodiment, the styrene-ethylene-butylene-styrene block copolymer and the polypropylene are mixed in a weight ratio of 1: 8 to 19, preferably 1: 8.5 to 13, more preferably 1: 11 to 12.5, May include 1: 12. In particular, in this embodiment, the styrene-ethylene-butylene-styrene block copolymer and the polypropylene are contained at a weight ratio of 1: 8 to 19, so that the filter plate of the present embodiment is thinner and more durable, Mechanical properties such as suitable tensile strength, elongation, and the like.

The filler improves the durability and mechanical properties of the filter plate of the present embodiment, and all kinds of fillers known in the art can be applied without limitation. In this embodiment, barium sulfate as a filler (Barium sulfate), MgO (Magnesium oxide), calcium carbonate (Calcium carbonate), titanium dioxide (Titanium dioxide), zinc oxide (Zinc oxide), alumina (Alumina), silica (Silica) At least one selected from the group consisting of Mica, Talc, Clay, Bentonite , Zeolite, Glass fiber and Carbon black. But is not limited thereto.

The resin composition of the present embodiment may contain 2 to 7% by weight, more preferably 2.5 to 5% by weight, and more preferably 3 to 4% by weight of a filler based on the total weight of the resin composition.

If the resin composition of this embodiment contains less than 2% by weight of the filler based on the total weight of the resin composition, the durability and mechanical properties of this embodiment may not be sufficiently improved. On the other hand, when the resin composition of this example contains more than 7% by weight of the filler based on the total weight of the resin composition, the styrene-ethylene-butylene-styrene block copolymer and the polypropylene may not be tightly bonded have. That is, the inner structure of the filter plate may not be densified, and durability and mechanical properties may be deteriorated.

Particularly, the filler of the present embodiment is mixed with calcium carbonate, bentonite and zeolite at a weight ratio of 1: 0.1 to 2: 0.1 to 2, preferably 1: 0.5 to 1.7: 0.5 to 1.7, more preferably 1: 0.5 to 1: 1.5 weight ratio, and most preferably in a weight ratio of 1: 0.7: 1. In particular, it may be desirable to add a small amount of bentonite in comparison to calcium carbonate and zeolite in the filler. Accordingly, the filter plate of the present embodiment may have a thin thickness, durability and mechanical properties, and may be free from whitening.

The organic peroxide is intended to improve the flowability and moldability of the resin composition of this embodiment. For example, t-amyl peroxybenzoate, t-butyl hydroperoxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, t-butyl peroxyisopropylcarbonate, diacetyl peroxide, But may include at least one member selected from the group consisting of dibenzoyl peroxide, dicyclohexane, dibutylperoxyl dicarbonate, trimethyl cyclohexane, dicecanoyl peroxide and peroxyl dicarbonate, And it is possible to apply all known organic peroxides.

In this embodiment, an additive containing at least one selected from the group consisting of antifoaming agents, pigments, antioxidants, and light stabilizers may be further added to form a filter plate having a thin thickness and excellent durability and mechanical properties.

The defoaming agent may include at least one selected from the group consisting of a silicone compound, a non-silicone compound, a fatty acid compound and a fluorine compound, but is not limited thereto.

The pigment may include, but is not limited to, at least one selected from the group consisting of titanium oxide, zinc oxide, zinc sulfide, zinc white, zinc sulfate, barium sulfate, calcium carbonate and alumina.

The antioxidant is 2,4,6-tri-t-butylphenol, 2,6-di-t-butyl-4-n-butylphenol, 2,6- - octadecyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, pentaerythrityl tetrakis [3- (3,5- (3,5-di-t-butylphenyl) propionate], di-n-octadecyl (3,5- (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate or a sterically hindered piperidine carboxylic acid, 2,6-dihydroxy-9 -Azabicyclo [3.3.1] nonane, or an acylated derivative of a non-bicyclic hindered amine or diphenylamine or dinaphthylamine, phenylnaphthylamine, N, N'-diphenylphenylenediamine or p- Phenyl-2-naphthylamine, N- (p-dodecyl) phenyl-2-naphthylamine, di -1-naphthylamine, di-2- Di (t-butyl) phenol, 4-methyl-2,6-di- ((tert-butyl) phenol, t-butyl) phenol, 4,4'-methylenebis (2,6-di- (t-butyl) phenol), methylhydroxyhydrocinnamide, phenothiazine derivatives, alkoxylated 5-aminotetrazole But are not limited to, di-, t-butyl p-aminophenol, lecithin, ascorbic acid, delta-tocopherol, rosemary extract, oat extract, soybean extract and green tea extract.

The light stabilizer has the effect of preventing aging and color change caused by exposure to light for a long time, and is a component capable of performing ultraviolet ray blocking, light energy absorption and conversion, free radical removal function and the like. The light stabilizer may include at least one selected from the group consisting of UV absorbers and UV hindered amine light stabilizers which are organic amine compounds.

The ultraviolet absorbing light stabilizer may include benzophenone, oxanilide, benzotriazole, triazine, etc. Examples of the organic amine light stabilizer include 4-benzoyloxy-2,2,6,6-tetramethyl Di-tert-butylphenyl-3,5-di-tert-butyl-hydroxybenzoide, and the like.

Particularly, in this embodiment, when the antifoaming agent, the antioxidant and the light stabilizer are included, the filter plate of this embodiment can have excellent durability and mechanical properties.

FIG. 1 is a perspective view of a membrane filter plate for a filter press according to an embodiment of the present invention, and FIG. 2 is a photographic view of a membrane filter plate for a filter press shown in FIG.

1 and 2, the membrane filter plate 1 for a filter press formed by using the resin composition of the present embodiment may be formed in the form of a plate 10 and may have a plurality of projections 20 formed on one surface thereof. The filtrate having passed through the filter cloth in the process of dewatering the slurry by using the filter press including the filter plates of FIGS. 1 and 2 can be discharged to the outside of the filter plate while flowing through the space formed by the plurality of protrusions.

FIG. 3 is a view showing a part of a filter press to which the membrane filter plate for the filter press of FIG. 1 is applied.

Referring to FIG. 3, the filter press may include a frame in the form of a frame, a filter plate inserted into the frame, and a filter cloth (not shown) surrounding the filter plate and the frame. In addition, the filter press includes, in addition to the filtration part including the filtration plate of the present embodiment, a pressing part (not shown) for applying pressure to the filtration part to make the filtration plate abutting each other come into close contact with each other to dewater the sludge, (Not shown), and the like, and may further include all configurations for forming or operating the filter press.

Hereinafter, a membrane filter plate for a filter press having improved durability and mechanical properties according to the present invention will be described in detail through examples, comparative examples and experimental examples. These embodiments are only for illustrating the present invention, and thus the scope of the present invention is not construed as being limited by these embodiments.

Example

Example  1 to 5

A resin composition having the composition shown in Table 1 (unit: wt%) was prepared and then injected in the form shown in Fig. 1 to prepare a membrane filter plate for a filter press. As the filler, calcium carbonate, bentonite and zeolite were mixed in a weight ratio of 1: 0.7: 1. As the organic peroxide, diacetyl peroxide and t-butyl hydroperoxide were mixed at a weight ratio of 1: 2 .

Polypropylene (PP) having a degree of polymerization of 680 was used, and a small amount of defoamer, antioxidant and light stabilizer were added in addition to SEBS, PP, filler and organic peroxide.

Example One 2 3 4 5 SEBS 10.0 4.0 6.0 8.0 3.0 PP 68.0 74.0 72.0 70.0 75.0 Filler 3.0 3.0 3.0 3.0 3.0 Organic peroxide To.100

Example  6

The procedure of Example 1 was repeated except that only calcium carbonate was used as a filler.

Example  7

Except that calcium carbonate, bentonite and zeolite were mixed in a weight ratio of 1: 1: 1 as a filler.

Example  8

Except that calcium carbonate, bentonite and zeolite as fillers were mixed in a weight ratio of 1: 1.5: 1.

Comparative Example

Comparative Example  One

A conventional membrane filter plate for a filter press was prepared.

Comparative Example  2 to 7

The procedure of Example 1 was repeated except that the composition was changed to the following Table 2.

Comparative Example 2 3 4 5 6 7 SEBS 1.0 15.0 1.0 1.0 1.0 1.0 PP 68.0 68.0 55.0 85.0 68.0 68.0 Filler 3.0 3.0 3.0 3.0 1.0 10.0 Organic peroxide To.100

Comparative Example  8 to 11

Except that the polystyrene type elastomer shown in Table 3 was used in place of SEBS.

A polystyrene-based elastomer Comparative Example  8 Styrene-butadiene-styrene block copolymer (SBS) Comparative Example  9 Styrene-isoprene-butadiene-styrene block copolymer (SIBS) Comparative Example  10 Styrene-ethylene-propylene-styrene block copolymer (SEPS) Comparative Example  11 Styrene-butadiene-butylene-styrene block copolymer (SBBS)

Comparative Example  12

The procedure of Example 1 was repeated except that only SEBS was not used and polypropylene (85 wt%) was used.

Experimental Example

Experimental Example  1: Thickness evaluation

(1) Thickness measurement

The thickness (± 0.05) 4 of the membrane filter plate for the filter press produced according to Examples 1 to 5 and the filter plate of Comparative Example 1 were measured and are shown in Table 4.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Thickness (mm) 3.2 mm 3.2 mm 3.0 mm 3.1 mm 3.2 mm 4.0 mm

As shown in Table 4, the thicknesses of Examples 1 to 5 are about 3.0 to 3.2 mm, which is smaller than that of Comparative Example 1.

(2) Thickness evaluation

4 is a cross-sectional view of the filter plate according to Example 1 and Comparative Example 1 in order to compare the thicknesses of Example 1 and Comparative Example 1.

4, it can be visually confirmed that the thickness of the first embodiment is thinner than that of the first comparative example.

Experimental Example  2: Durability evaluation

(One) Of the filter plate  Evaluation of durability through tensile and shrinkage

(Both sides of the filter plate according to the examples and the comparative example) were fixed, and then the central part of the filter plate was moved in the vertical direction (stroke: 70 mm) by applying a constant force Lt; / RTI > At this time, the filter plates of Examples 1 to 8 and Comparative Examples 2 to 12 had a thickness of 3 ± 0.2 mm, and Comparative Example 1 had a thickness of 4 ± 0.2 mm (see Experimental Example 1).

At this time, after the upper side movement, the lower side movement and the return to the original position were performed once, and the state of the filter plate was visually observed after performing a total of 100,000 repetitions. The results are shown in Tables 5 and 6 . The above repetitive motion is performed 100,000 times is the number of times when the filter press is operated for 20 years under the assumption that the filter press is operated for 20 hours a day (about 13 times of tension / shrinkage).

The whitening phenomenon is represented by: degree of whitening; degree of whitening; and degree of whitening.

Example 1 Example 2 Example 3 Example 4 Whitening X X X X Example 5 Example  6 Example  7 Example  8 Whitening X ○ △ △

Comparative Example  One Comparative Example  2 Comparative Example  3 Comparative Example  4 Comparative Example  5 Comparative Example  6 Whitening ○ ○ ○ ○ ○ ○ Comparative Example  7 Comparative Example  8 Comparative Example  9 Comparative Example 10 Comparative Example 11 Comparative Example 12 Whitening ○ ○ ○ △ ○ ○

As can be seen from Tables 5 and 6, the whitening phenomenon is apparent in the filter plate of the comparative example as compared with the embodiment.

(2) Filtration plate  Compare Photos

The filter plates of Examples 1, 3, 6 and 7 and Comparative Examples 1 to 7, which were repeatedly stretched and shrunk 100,000 times according to the above (1), are shown in Figs.

Fig. 5 shows the filter plate of Example 1, Fig. 6 shows the filter plate of Example 3, and according to the above (1), even if tensile and shrinkage are repeated 100,000 times, Can be confirmed.

FIG. 7 shows Example 6 in which only calcium carbonate is used as a filler, and whitening occurs when tensile and contraction are repeated 100,000 times according to the above (1). 8 shows the results of Example 7 where calcium carbonate, bentonite and zeolite were mixed at a weight ratio of 1: 1: 1 as a filler. When the tensile and shrinking were repeated 100,000 times according to the above (1) Can be confirmed. 5 to 8, calcium carbonate, bentonite, and zeolite are included as fillers, and when it is contained at a weight ratio of 1: 0.7: 1, it can be confirmed that whitening phenomenon hardly occurs.

9 to 14 show that the resin composition content (3 to 10 wt% of styrene-ethylene-butylene-styrene block copolymer, 60 to 80 wt% of polypropylene, 2 to 7 wt% of filler and residual organic peroxide) In Comparative Examples 2 to 7, which do not follow, the whitening phenomenon can be confirmed. In other words, according to FIGS. 5, 6 and 9 to 14, it can be confirmed that whitening does not occur according to the composition ratio of this embodiment.

FIG. 15 shows a conventional filter plate according to Comparative Example 1, and it can be confirmed that whitening has occurred.

Experimental Example  3: Evaluation of mechanical properties

The mechanical properties of the examples and comparative examples were evaluated. The results are shown in Tables 8 to 10, and the mechanical properties were evaluated according to the test methods of Table 7.

Test Items Test method Test Items Test method The tensile strength ASTM D638 Flexural strength ASTM D790 Yield elongation ASTM D638 Flexural modulus ASTM D790 Elongation at break ASTM D638 Impact strength ASTM D256 Tensile modulus ASTM D638 Hardness ASTM D2240

Example One 2 3 4 5 6 7 8 Tensile Strength (Mpa) 25.8 27.9 30.9 28.1 25.1 21.2 24.7 23.1 Yield elongation (%) 24.7 25.1 27 25.8 24.1 21.9 23.6 23.1 Elongation at break (%) 615 620 627 621 609 590 609 604 Tensile modulus (Mpa) 468 489 539 500 439 382 423 400 Flexural Strength (Mpa) 21.9 21.4 23.0 22.8 21.1 21.8 22.0 21.7 Flexural modulus (Mpa) 712 714 721 715 711 709 715 711 Impact strength (J / m) 603 638 699 650 589 480 531 500 Hardness 65 64 65 63 63 65 63 66

Comparative Example One 2 3 4 5 6 7 Tensile Strength (Mpa) 20.7 14.7 16.8 15.0 17.4 13.4 14.1 Yield elongation (%) 21 14.1 16.5 14.4 17.1 12.8 13.4 Elongation at break (%) 595 448 471 459 495 402 426 Tensile modulus (Mpa) 371 321 356 324 361 281 303 Flexural Strength (Mpa) 22.2 17.7 19.2 17.8 19.5 16.1 17.4 Flexural modulus (Mpa) 715 587 620 594 644 607 555 Impact strength (J / m) 448 234 347 261 409 159 184 Hardness 65 62 65 63 66 65 64

Comparative Example 8 9 10 11 12 Tensile Strength (Mpa) 20.1 19.0 19.4 18.7 11.8 Yield elongation (%) 20.8 21.0 19.8 19.1 10.1 Elongation at break (%) 584 566 574 580 324 Tensile modulus (Mpa) 368 334 358 361 265 Flexural Strength (Mpa) 21.1 18.9 19.4 20.7 14.6 Flexural modulus (Mpa) 685 650 660 674 528 Impact strength (J / m) 608 554 581 594 143 Hardness 64 63 65 65 60

Tables 8 to 10 show that the tensile strength, the yield elongation, the elongation at break, the tensile elastic modulus, the flexural strength, the flexural modulus and the impact strength of the examples were superior to those of the comparative examples, It can be confirmed that the mechanical properties are better than those of the filter plate according to the present invention.

That is, from the results of Experiments 1 to 3, it can be seen that the filter plate formed using the resin composition of this embodiment has a thin thickness and excellent durability and mechanical properties.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. You will understand. It is therefore to be understood that the embodiments described above are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1: Membrane filter plate for filter press
10: Edition
20: projection

Claims (6)

A membrane filter plate for a filter press having improved durability and mechanical properties,
The membrane filter plate for the filter press is formed using a resin composition containing a styrene-ethylene-butylene-styrene block copolymer, polypropylene, a filler and an organic peroxide However,
The resin composition
Based on the total weight of the resin composition, 3 to 10% by weight of a styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of a polypropylene, 2 to 7% by weight of a filler and residual organic peroxides Membrane filter plate for filter press.
The method according to claim 1,
The resin composition
Wherein the styrene-ethylene-butylene-styrene block copolymer and the polypropylene are contained in a weight ratio of 1: 8-19.
The method according to claim 1,
The filler
Barium sulfate (Barium sulfate), MgO (Magnesium oxide), calcium carbonate (Calcium carbonate), titanium dioxide (Titanium dioxide), zinc oxide (Zinc oxide), alumina (Alumina), silica (Silica), mica (Mica), talc (talc), the filter comprises a clay (clay), bentonite (bentonite), zeolite (zeolite), a glass fiber at least one selected from the group consisting of (glass fiber) and carbon black (carbon black) Membrane filter plate for press.
The method of claim 3,
The filler
The calcium carbonate (Calcium carbonate), a bentonite 1 (Bentonite) and zeolite (Zeolite): 0.1 ~ 2: 0.1 ~ membrane filter plate for a filter press characterized in that it comprises a weight ratio of 2.
The method according to claim 1,
The organic peroxide
butyl peroxybenzoate, t-butyl peroxybenzoate, t-butyl peroxybenzoate, t-butyl hydroperoxide, t-butyl peroxyacetate, , At least one selected from the group consisting of dicyclohexane, dibutylperoxyl dicarbonate, trimethyl cyclohexane, dideckanoyl peroxide and peroxyl dicarbonate. .
The method according to claim 1,
The resin composition
An additive comprising at least one selected from the group consisting of an antifoaming agent, a pigment, an antioxidant, and a light stabilizer.

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